/* combinatorial graph */
//import graph;
size(1.5inch);

pair p0 = (0,0);
pair p1 = (-3,1);
pair p2 = (-2,3);
pair p3 = (.5,2.5);
pair p4 = (2,2);

dot(p0);
dot(p1);
dot(p2);
dot(p3);
dot(p4);
draw(p0--p1);
draw(p1--p2);
draw(p0--p3);
draw(p1--p3);
draw(p2--p3);
draw(p0--p4);